1979-93 Mustang Ford Performance Adjustable Brake Proportioning Valve by Ford Performance

1979-93 Mustang Ford Performance Adjustable Brake Proportioning Valve
1979-93 Mustang Ford Performance Adjustable Brake Proportioning Valve
How To: Fox Body Mustang 5 Lug Disc Conversion - SVE (1987-1993)

Adjust the fluid pressure in your brakes with this Ford Performance adjustable brake proportioning valve.

Item #M2328C
MPN# M-2328-C

Everyday Low Price: $59.99

Out of Stock
 This item is returnable. Details

× close

Made in the USA


  • Allows Adjustment Of Fluid Pressures To Correct Brake Bias


  • Lightweight Billet Aluminum
  • Made In The USA
  • Fully Adjustable From 100-1000psi
  • Ford Racing Logo
  • Ford Racing #M-2328-C

 What's in the Box

  • (1) Proportioning Valve

Ford Performance Mustang Proportioning Valve
The Ford Performance M-2328-C Adjustable Proportioning Valve is cast from lightweight aluminum (only .5lb!) & is compact in design. It allows adjustment of fluid pressure to correct rear brake bias. The “Kneepoint” is adjustable from 100-1000psi. The housing has inlet and outlet ports with 1/8-27 NPT (National Pipe Thread) threads for maximum installation flexibility & includes the needed adapters to be a direct install for 79-93 Mustang.

Ford Performance Racing Parts "Packs" and Component Parts Limited Warranty - Click Here
Ford Performance Racing Parts - NO WARRANTY - Click Here
Ford Performance Racing Parts Crate Engine Limited Warranty - Click Here

  • Ford Mustang - 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993

Fitment Notice

  • Proportioning valves are normally installed in the rear fluid line to prevent the rear wheels from locking before the front wheels or to give a driver the ability to make fine adjustments in front-to-rear bias percentage on the track to compensate for tire wear, fuel load burn-off, or changing track conditions. It is generally not recommended to attempt to reduce front wheel braking capacity.
  • Use only the two .25" body holes to secure the valve to a mount. Do not attempt to remove the adjuster knob or valve body end cap to facilitate thru-panel mounting.
  • Two 1/8-27 NPT to 3/8-24 inverted flare fittings are supplied to adapt double flared hard brake lines to the valve. Connect the "IN" port to the pressure line coming from the master cylinder. Connect the line going to the calipers to the "OUT" port.
  • The adjusting knob is marked with an arrow indicating the direction required to decrease line pressure to the calipers. The knob rotated all the way out (counter-clockwise) will provide a maximum pressure reduction of 57%. Rotating the know in (clockwise) will incrementally increase line pressure up to full pressure. If the valve adjustment range is insufficient to balance the vehicle’s bias properly, changes to other components within the system may be necessary.
  • Do not attempt to operate the vehicle until the system has been fully tested under controlled conditions in a safe location. After the system has been bled, checked for leaks, and the proper pedal resistance and travel have been determined, make a series of low-speed stops, then gradually progress to normal operating speeds.
  • WARNING - Adjustable proportioning valves are designed to tune and balance custom brake systems on performance, racing, and other special-purpose vehicles. They are not designed as direct replacements for any OEM application.
  • WARNING It is the responsibility of the person installing any brake component or kit to determine the suitability of the component or kit for that particular application. If you are unsure how to use this brake component or kit safely, you should not install or use it. Do not assume anything. Improperly installed or maintained brakes are dangerous. If you are not sure, get help or return the product. You may obtain additional information and technical support by calling at (254) 296-6500 or visiting our website at The use of technical support does not guarantee proper installation. You or the person who does the installation must know how to use this product properly. It is impossible over the phone to understand or foresee all the issues that might arise in your installation. Racing equipment and brakes must be maintained and checked regularly for fatigue, damage, and wear. 
  • Proper bleeding of the entire brake system is required upon installation.

How To: Fox Body Mustang 5 Lug Disc Conversion - SVE (1987-1993)

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

California Residents:
Prop 65 Warning SignWARNING: Cancer and Reproductive Harm-

About This Brand

Ford Performance
Ford Performance - Mustang Ford Racing Parts
Ford Performance Parts is the leader in performance parts and accessories for Mustang and Ford Lightning. is proud to offer Ford Racing Performance Parts for your project. Ford Racing is dedicated to manufacturing the highest quality products offered in the industry. Choose from suspension, exhaust, wheels, and other performance parts at Late Model Restoration. If you want the best for your Mustang or SVT Lightning, look no further than Ford Performance Parts!